fix: Keep node_modules for runtime dependencies and add troubleshooting guide

Critical fix:
- Dockerfile: Do not delete node_modules folders (socket.io needed at runtime)
- Only remove .git folders and Python cache
- Preserve all npm packages for WebSocket functionality

New documentation:
- dokploy/TROUBLESHOOTING.md: Common issues and solutions
  * WebSocket host not found
  * socket.io module not found
  * Frontend restart loop
  * Site not found errors

This fixes:
- Frontend restart loop
- WebSocket container crashes
- socket.io MODULE_NOT_FOUND errors

WebSocket requires socket.io, redis, socket.io-redis packages at runtime.
These must NOT be deleted in Dockerfile cleanup.

dokploy/Dockerfile

@@ -144,12 +144,11 @@ RUN cd /home/frappe/frappe-bench && \
     bench get-app payments https://github.com/frappe/payments && \
     find apps/payments -name "*.pyc" -delete && \
     find apps/payments -name "__pycache__" -type d -exec rm -rf {} + 2>/dev/null || true && \
-    # Final cleanup
+    # Final cleanup (keep node_modules for runtime dependencies like socket.io)
     echo "{}" > sites/common_site_config.json && \
-    find apps -mindepth 1 -path "*/.git" | xargs rm -fr && \
+    find apps -mindepth 1 -path "*/.git" -type d -exec rm -rf {} + 2>/dev/null || true && \
     find apps -name "*.pyc" -delete && \
     find apps -name "__pycache__" -type d -exec rm -rf {} + 2>/dev/null || true && \
-    find apps -name "node_modules" -type d -exec rm -rf {} + 2>/dev/null || true && \
     find apps -name ".git" -type d -exec rm -rf {} + 2>/dev/null || true
 
 FROM base AS erpnext-complete

dokploy/TROUBLESHOOTING.md

@@ -0,0 +1,177 @@
+# Sorun Giderme Kılavuzu
+
+## 🐛 Yaygın Sorunlar ve Çözümler
+
+### Frontend: "websocket:9000 host not found"
+
+**Hata**:
+```
+[emerg] host not found in upstream "websocket:9000"
+```
+
+**Sebep**: WebSocket container başlamadı veya başlatılamadı
+
+**Çözüm 1**: WebSocket container loglarını kontrol edin
+```bash
+docker-compose logs websocket
+
+# Eğer "socket.io module not found" hatası varsa:
+# Image'i yeniden build edin (node_modules kaldırılmış olabilir)
+docker-compose build --no-cache
+docker-compose up -d
+```
+
+**Çözüm 2**: Container'ları sırayla başlatın
+```bash
+# Tüm container'ları durdurun
+docker-compose down
+
+# create-site container'ını çalıştırın
+docker-compose up create-site
+
+# Sonra diğerlerini başlatın
+docker-compose up -d
+```
+
+### WebSocket: "Cannot find module 'socket.io'"
+
+**Hata**:
+```
+Error: Cannot find module 'socket.io'
+```
+
+**Sebep**: Node.js dependencies eksik
+
+**Çözüm**: Container'a girin ve socket.io'yu yeniden yükleyin
+```bash
+# Backend container'a girin
+docker exec -it <backend-container> bash
+
+# Frappe klasörüne gidin
+cd /home/frappe/frappe-bench/apps/frappe
+
+# Socket.io'yu yükleyin
+npm install socket.io redis socket.io-redis
+
+# Restart
+exit
+docker-compose restart websocket frontend
+```
+
+**Kalıcı Çözüm**: Image'i yeniden build edin
+```bash
+# Dokploy'da
+1. Service → Settings → Redeploy
+2. Build cache temizlenecek
+3. Dependencies doğru yüklenecek
+```
+
+### Site Açılmıyor
+
+**Kontroller**:
+```bash
+# 1. Backend çalışıyor mu?
+docker-compose ps backend
+
+# 2. Backend logları
+docker-compose logs backend
+
+# 3. create-site başarılı mı?
+docker-compose logs create-site
+
+# 4. Database bağlantısı
+docker-compose exec backend wait-for-it mariadb:3306
+```
+
+### "Site not found"
+
+**Çözüm**:
+```bash
+# Site listesini kontrol edin
+docker exec <backend> bench --site all list-apps
+
+# Site yoksa yeniden oluşturun
+docker-compose up create-site
+```
+
+## 🔄 Genel Çözümler
+
+### Temiz Başlangıç
+
+```bash
+# Tüm container'ları silin
+docker-compose down -v
+
+# Yeniden başlatın
+docker-compose up -d
+
+# Logları izleyin
+docker-compose logs -f
+```
+
+### Image Yeniden Build
+
+```bash
+# Local'de
+docker-compose build --no-cache
+docker-compose up -d
+
+# Dokploy'da
+Service → Settings → Redeploy (Build Cache: No Cache)
+```
+
+### Container Sıralaması
+
+Container'lar doğru sırayla başlamalı:
+```
+1. MariaDB, Redis → healthy
+2. Configurator → complete
+3. create-site → complete
+4. backend → healthy
+5. websocket → healthy
+6. frontend → healthy
+7. workers, scheduler → running
+```
+
+## 📊 Health Check
+
+```bash
+# Tüm container'lar healthy mi?
+docker-compose ps
+
+# Beklenen çıktı:
+NAME                    STATUS
+mariadb                 Up (healthy)
+redis-cache             Up (healthy)
+redis-queue             Up (healthy)
+backend                 Up (healthy)
+websocket               Up
+frontend                Up (healthy)
+queue-short             Up
+queue-long              Up
+scheduler               Up
+```
+
+## 🔍 Debug Mode
+
+```bash
+# Backend container'a girin
+docker exec -it <backend> bash
+
+# Bench console
+bench console
+
+# Python'da:
+import frappe
+frappe.init(site='<site-name>')
+frappe.connect()
+
+# Test
+frappe.db.get_list('User', limit=1)
+```
+
+---
+
+**Common Issues**: websocket, site not found, dependencies  
+**Solution**: Rebuild image, restart containers, check logs
+